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112K views · 2K reactions | Living underground sounds like a bad deal: no sunlight, no fresh air, no Internet… But historically, caves and other subterranean dwellings were popular because they offered the best protection. To this day, underground bunkers are used to house ultra-secure military installations. The places on this list were constructed in different eras, but there’s a unique history behind each one. | Sunday Roast | Facebook
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